Depends where you are in China. You are in Tianjin. Despite the heavy pollution, Tianjin is a decent, first-tier city. I'm in Shenzhen and some of the teachers here are making 150 to 250 rmb/hr. One teacher I know was recently offered 8000 rmb/month to give private lessons to a wealthy businessman. That is not the norm but those opportunities do exist.
Shoot for 250 rmb/hr but expect about 150 - 200 rmb/hr.